<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图-->
        <el-card>
            <!-- 提示区 -->
            <el-alert
                    title="添加商品信息"
                    type="info"
                    center
                    show-icon
                    :closable="false"
            >
            </el-alert>
            <!-- 步骤条区-->
            <el-steps :space="200" :active="activeIndex -0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <!-- tab 栏区域-->
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave"
                         @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                    expand-trigger="hover"
                                    v-model="addForm.goods_cat"
                                    :options="cateList"
                                    :props="cateProps"
                                    @change="handleChange"
                                    clearable
                                    change-on-select
                            >
                            </el-cascader>
                        </el-form-item>

                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.sttr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                        12
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 图片要上传的服务器地址
                        list-type ：图片组件效果
                        -->
                        <el-upload
                                :action="uploadURL"
                                :on-preview="handlePreview"
                                :on-remove="handleRemove"
                                list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.good_introduce">
                        </quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
                title="图片预览"
                :visible.sync="previewVisible"
                width="50%"
        >
            <img :src="previewPath" alt="" class="previewImg">

        </el-dialog>

    </div>
</template>

<script>
    /* 导入 lodash */
    import _ from 'lodash'

    export default {
        name: "Add",
        data() {
            return {
                activeIndex: '0',
                // 添加商品表单数据对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cat: [],
                    // 图片数组
                    pics: [],
                    // 商品详情描述
                    good_introduce: '',
                    // 商品的动态参数或静态属性
                    attrs: []
                },
                // 商品表单验证规则
                addFormRules: {
                    goods_name: [
                        {required: true, message: '请输入商品名称', trigger: 'blur'},
                    ],
                    goods_price: [
                        {required: true, message: '请输入商品价格', trigger: 'blur'},
                    ],
                    goods_weight: [
                        {required: true, message: '请输入商品重量', trigger: 'blur'},
                    ],
                    goods_number: [
                        {required: true, message: '请输入商品数量', trigger: 'blur'},
                    ],
                    goods_cat: [
                        {required: true, message: '请选择商品分类', trigger: 'blur'},
                    ]
                },
                // 商品分类列表
                cateList: [],
                cateProps: {
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children'
                },
                // 动态参数列表数组
                manyTableData: [],
                // 静态属性数组
                onlyTableData: [],
                // 上传图片的URL地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token')
                },
                previewPath: '',
                previewVisible: false
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有商品分类数据
            async getCateList() {
                const {data: res} = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类失败')
                }
                this.cateList = res.data
                console.log(this.cateList)
            },
            // 级联选择器选中项变化，会触发这个函数
            handleChange() {
                console.log(this.addForm.goods_cat)
                if (this.addForm.goods_cat.length !== 3) {
                    this.addForm.goods_cat = []
                }
            },
            // 切换 tab会触发该函数
            beforeTabLeave(activeName, oldActiveName) {
                if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请先选择商品分类')
                    return false
                }
            },
            // 点击tab页签触发
            async tabClicked() {
                // 动态参数面板
                if (this.activeIndex === '1') {
                    // 根据所选分类的id和当前所选的面板，获取对应的参数
                    const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {
                            sel: 'many'
                        }
                    })
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败')
                    }
                    console.log(res.data)
                    res.data.forEach(item => {
                        item.attr_vals =
                            item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
                    })
                    this.manyTableData = res.data
                } else if (this.activeIndex === '2') {
                    // 根据所选分类的id和当前所选的面板，获取对应的静态属性
                    const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {
                            sel: 'only'
                        }
                    })
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取静态属性失败')
                    }
                    console.log(res.data)
                    this.onlyTableData = res.data
                }
            },
            // 处理图片的预览效果
            handlePreview(file) {
                this.previewPath = file.response.data.url
                this.previewVisible = true

            },
            // 处理移除图片的操作
            handleRemove(file) {
                // 1 获取要删除的图片的临时路径
                const filePath = file.response.data.tmp_path
                // 2 从 pics 数组中，找到这个图片对应的索引值
                const i =
                    this.addForm.pics.findIndex(x =>
                        x.pic === filePath)
                // 3 调用数组的 Splice 方法，把图片信息对象，从 pics 数组中移除
                this.addForm.pics.splice(i, 1)
                console.log(this.addForm)
            },
            // 监听图片上传成功的事件
            handleSuccess(response) {
                console.log('')
                // 1 拼接得到一个图片信息对象
                const picInfo = {
                    pic:
                    response.data.tmp_path
                }
                // 2 将图片信息对象 保存到 pics
                this.addForm.pics.push(picInfo)
                console.log(this.addForm)
            },
            // 添加商品
            add() {
                this.$refs.addFormRef.validate(async valid => {
                    // 添加表单预验证
                    if (!valid) {
                        return this.$message.error('请填写必要的表单项！')
                    }
                    // 执行添加业务逻辑
                    // lodash cloneDeep(obj)
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(',')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log(form)

                    // 发起请求添加商品
                    // 商品的名称，必须是唯一的
                    const {data: res} = await this.$http.post('goods', form)
                    if (res.meta.status !== 201) {
                        this.$message.error('添加商品失败！')
                    }
                    this.$message.success('添加商品成功！')
                    this.$router.push('/goods')
                })
            }
        },
        computed: {
            // 当前选中的三级分类的Id
            cateId() {
                if (this.addForm.goods_cat.length === 3) {
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        }
    }
</script>

<style scoped>
    .el-checkbox {
        margin: 0 10px 0 0 !important;
    }

    .previewImg {
        width: 100%;
    }

    .btnAdd {
        margin-top: 15px;
    }
</style>
